PHP Object Oriented (OOP) Day 1

1. The difference between classes and objects:

2. Modifiers:

3. Inheritance:

4. Overloaded Concept:

概 5. Concept of rewriting:

6.

Abstract: 7. Interface:

The above has introduced the first day of PHP object-oriented (OOP), including aspects of the content. I hope it will be helpful to friends who are interested in PHP tutorials.